Machine

*A*can manufacture 1200 widgets in 4 hours and Machine*B*can manufacture the same number of widgets in 5 hours. After working together at their respective rates for 2 hours in order to fill a 1200 widget lot, what fraction of the lot still remains to be manufactured?
Typical problem in the GMAT today, they give you unnecessary data.

ReplyDeleteanswer A

ReplyDeletem/c A rate of work = 1/4

ReplyDeletem/c B rate of work = 1/5

together A + B = 9/20 per hourly rate

in 2 hrs = 18/20

remaining work = 2/20 = 1/10 ..OA A

There is nothing unnecessary data here

ReplyDelete